JPH0870307A - Wireless communication device, switching system, communication device and methods thereof - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a wireless communication device and a method thereof, which improves the convenience of data transmission in which data transmission can be performed according to the priority of transmission data. [Configuration] When the wireless communication device 101 receives transmission data from the data terminal 112, the type of the data is determined,
The carrier sense unit 107 checks whether or not another terminal is transmitting data, and if the carrier is not transmitted, the time set according to the priority of the transmission data,
Make a career sense. After the set time has elapsed, it is determined whether or not another terminal is transmitting a carrier, which is an indication of data transmission, and as a result, if the carrier is not transmitting, the carrier transmitting unit 106 transmits the carrier a specified number of times, By transmitting data from the wireless communication unit 108, it is possible to transmit data with a high priority first.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication device, a switching system, a communication device, and methods for connecting various data terminals and performing wireless communication.

[0002]

2. Description of the Related Art In recent years, due to the remarkable progress of the information society,
A personal computer (personal computer) or the like has a communication function and exchanges data more and more. Accordingly, as a medium for information communication, for example, I
SDN (Digital Integrated Services Network), LAN (Local Area Network), etc. have become popular.

Further, a wireless system has been developed for the purpose of carrying out these communications while moving and for the purpose of using them without troublesome wiring work. Currently, radio wave radio systems using the SS (spread spectrum) system, radio systems using optical beams, and the like are currently provided.

When transmitting in a wireless system, there is a possibility that a plurality of terminals will start transmitting at the same time. In such a case, the data transmitted by each terminal will collide, so the data will be corrupted, the data will not be transmitted to the receiving side, and the data cannot be received while the data is being transmitted. I didn't know which terminal to send if it was broken.

Therefore, conventionally, in such a radio system, a method such as CSMA / CA (carrier detection multiple access / collision avoidance) is adopted. Before transmitting data, a collision detection window is provided, a carrier as a transmission request is transmitted several times during this period, and the intention of transmission is displayed to surrounding terminals. The transmission interval of this carrier is set by a random number so as not to collide with other terminals. Then, during this collision detection window, the carrier from another terminal is monitored, and if there is no terminal that transmits the carrier and indicates the intention of transmission, the data is transmitted.

During this period, when a carrier from another terminal is detected, the carrier is transmitted a specified number of times, a time is set by a random number, and after waiting for that time, a collision detection window is provided and the carrier is detected. Make a call and start expressing your intention to send. In this way, by colliding carriers, the intentions of the surrounding terminals for data transmission are confirmed, and communication is performed while avoiding data collision.

[0007]

However, in the above conventional example, the CSMA / CA used in the wireless communication device is used.
However, even if there is data to be preferentially sent, there is a problem that the data cannot be sent if another terminal is issuing a carrier indicating the intention to send.

An object of the present invention is to provide a wireless communication device and a method thereof, which improves the convenience of data transmission in which the wireless communication device can perform data transmission according to the priority of transmission data.

A further object of the present invention is to detect the transmission request of another communication device at the time when the transmission request determined by the priority of data is detected immediately after the communication of the other communication device is completed. To provide a wireless communication device, a switching system and a method thereof capable of eliminating carrier collision for a transmission request.

A further object of the present invention is to provide a communication device and method for determining the priority by the calling side and the called side.

[0011]

In order to achieve the above object, the wireless communication method of the present invention has the following steps.

That is, in a wireless communication method for performing wireless communication between a plurality of data terminals, when another wireless communication device is not transmitting data, the other communication device transmits data according to the priority of the data to be transmitted. Set the time to detect the transmission request, detect the transmission request from other communication devices during the set time, and send the transmission request based on the result,
It has each process of transmitting data.

Further, in order to achieve the above object, the communication method of the present invention has the following steps. That is, in a communication method in which time-division communication is performed, a slot position in a communication frame for detecting a transmission request from another communication device is set according to the priority of data to be transmitted, and another slot is set in the set slot. It includes steps for detecting whether there is a transmission request from the communication device, transmitting a transmission request based on the result, and transmitting data.

In order to achieve the above object, the wireless communication device according to the present invention has the following configuration.

That is, in a wireless communication device that performs wireless communication between a plurality of data terminals, setting means for setting a time for detecting a transmission request from another wireless communication device according to the priority order of data to be transmitted, and others. Detection means for detecting a transmission request from the wireless communication device and another wireless communication device are not transmitting data, the detection means performs detection for a predetermined time set by the setting means, and as a result, And transmitting means for transmitting data after transmitting a transmission request based on the above.

In order to achieve the above object, the exchange system according to the present invention has the following configuration.

That is, in a switching system composed of a main device having a switching function and a wireless communication device for performing communication between the wireless communication devices after the main device performs a wireless link, according to the priority of data to be transmitted. Setting means for setting a slot in a communication frame for detecting a transmission request from the other wireless communication device, detection means for detecting a transmission request from the other wireless communication device, and the detection means are set by the setting means. A transmission request is detected based on the result of the detection of the transmission request in the slot, and the data is transmitted.

In order to achieve the above object, the communication device of the present invention has the following configuration. That is, in a communication device that performs time-division communication, a setting unit that sets a slot position in a communication frame that detects a transmission request from another communication device according to the priority of data to be transmitted, and another communication device Detecting means for detecting a transmission request in the slot set by the setting means, transmitting means for transmitting a transmission request based on the detection result, and transmitting means for transmitting data. Equipped with.

[0019]

In such a configuration, the time for detecting the transmission request from the other wireless communication device is set according to the priority of the data to be transmitted, the transmission request from the other wireless communication device is detected, and the other wireless communication device is detected. When the device is not transmitting data, the detection means operates to detect for a predetermined time set by the setting means, and based on the detection result, issues a transmission request and then operates to transmit data.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described in detail below with reference to the drawings.

In the present embodiment, radio waves will be described as an example of a wireless communication medium, but the present invention is not limited to this, and similar effects can be obtained with, for example, a light beam. In the following description, radio waves and light beams are referred to as "carriers".
As described below.

FIG. 1 is a schematic block diagram showing the configuration of the wireless communication apparatus in the first embodiment. In FIG. 1, 1
A wireless communication device 01 transmits and receives wireless data according to a wireless communication method described later. A terminal communication unit 102 exchanges data with a data terminal described later.
A main control unit 103 controls the entire wireless communication device according to a processing procedure (program) stored in a main storage unit described later. A main storage unit 104 stores the flowchart shown in FIG. 4, various control data, and the like. A priority selection unit 105 selects the priority of data to be transmitted from a data terminal described later.

Reference numeral 106 denotes a carrier transmission unit, which transmits a carrier for indicating the intention of data transmission using a wireless communication unit described later. 107 is a carrier sense unit,
Detects data and carriers transmitted from other terminals.
A wireless communication unit 108 controls transmission and reception of data and carriers. Reference numeral 109 is an antenna for transmitting and receiving data and carriers. 110 is a wireless communication device 1
01 internal bus. Reference numeral 111 connects the data terminal 112 and the wireless communication apparatus 101, and includes a LAN,
SCSI, RS232C, internal bus of data terminal, etc. Reference numeral 112 denotes a data terminal that prioritizes the data, creates, displays, and prints the data.

It is assumed that the operator arbitrarily sets the order of priority of the data at the data terminal according to the type of the data, and the priority selecting unit 105 recognizes the priority of the data.

Hereinafter, a case where the wireless communication devices (three terminals A, B, and C) shown in FIG. 1 perform communication will be described.

FIG. 2 is a diagram showing a carrier transmission state of each terminal in this embodiment. In the example shown in FIG. 2, the terminal C
Shows that terminal A transmits a carrier after a time T and terminal B transmits a carrier after a time t (t> T). When there are a plurality of terminals transmitting carriers at time T or time t, 0 <Tt <
By using the time T and the time t as random numbers within the range of To to transmit the carrier, even if there are a plurality of terminals that transmit the carrier at the time T or the time t, the collision of carriers in the data transmission request can be avoided. be able to.

Further, FIG. 3 is a diagram showing a case where carrier transmissions collide with each other in the first embodiment. In the example shown in FIG. 3, the carriers transmitted from the terminals A and B collide with each other. Further, the terminal A is a terminal that is trying to send data with high priority. Terminal B is a terminal that is trying to send low priority data, and terminal C
Is the terminal that is in the middle of sending data.

Data transmission according to the first embodiment having the above configuration will be described below with reference to the flowchart shown in FIG.

First, when the transmission data is received from the data terminal 112 via the internal bus 111 in step S401, the type of the data is determined in the next step S402. Then, in step S403, the carrier sense unit 107 checks whether another terminal is transmitting data. As a result, if the data has been transmitted, the process proceeds to step S404 and waits until the data transmission is completed. If the carrier has not been transmitted, the process proceeds to step S405 to check whether the transmission data is high priority data. As a result, if the transmission data has high priority, the process proceeds to step S406 and waits for the time T while performing carrier sensing. If the data has a low priority, the process proceeds to step S407 and waits for the time t while performing carrier sense.

The times T and t are values created by each wireless communication device using random numbers when transmitting data, and T is a value smaller than t.

Next, when the time set in step S406 or S407 elapses, step S408
Then, it is determined whether or not another terminal is transmitting a carrier, which is an indication of intention to transmit data, within the time. Here, if the call is transmitted, the process returns to step S403 and the above-mentioned processing is repeated. However, if it has not been transmitted, the process proceeds to step S409, and the carrier transmitting unit 106 transmits the carrier indicating the intention of data transmission. Then, in step S410,
It is checked whether the carrier has been transmitted the designated number of times. If the designated number of times has not been transmitted, the process returns to step S405, and if the designated number of times has been transmitted, the process proceeds to step S411 and data is transmitted via the wireless communication unit 108.

As described above, according to the first embodiment, the time from the end of transmission of data by another terminal to the transmission of a carrier, which is an indication of transmission, is changed according to the priority of transmission data. As a result, as shown in FIG. 2, the data with higher priority can be sent first. Then, the terminal B senses the carrier from the terminal A in step S408, returns to step S403, and transmits the data when the carrier transmitted by the terminal A is interrupted. Also,
As shown in FIG. 3, even when the carriers collide with each other, the next carrier comes first from the terminal A, so that the terminal A, which is trying to send the data with high priority, can send the data first.

In this embodiment, the data is transmitted after transmitting the carrier, which is the transmission intention, but the time until the data is transmitted is changed even when the data is directly transmitted without leaving the carrier. In this way, data can be similarly prioritized and transmitted.

Further, in the present embodiment, the priority order of data is set in the data terminal by the operator of the data terminal.
It is also possible to prioritize data types, data terminal types, and data terminals.

Another embodiment will be described below.

In the second embodiment, a detailed description will be given of the case where the digital radio communication by the frequency hopping method is used for the extension transmission of the switching system.

(System Configuration) FIG. 5 shows a configuration diagram of a system assumed in the second embodiment.

This system accommodates a public line 102 and has an exchange 101 having a switching function and a wireless connection function, and a plurality of wireless dedicated telephones 103-A, 103-for communicating control data and voice data with the exchange 101. B, data terminal devices 104-A to 104- for performing control data communication with an exchange and direct data communication between terminals
Composed of F. The definition of the data terminal device in the second embodiment is that “a terminal (data terminal) having a function of transmitting an arbitrary amount of data in a burst and a wireless adapter that controls wireless communication between the data terminal and the main device are combined. "
And the data terminal is a computer 104-A.
Not only the printer 104-B, the copying machine 104-C, the video conference terminal 104-D, the facsimile 104-E, L
The AN bridge 104-F, other various terminals that perform data processing such as an electronic camera, a video camera, a scanner, and the like are applicable.

These radio-only telephones and data terminals are
A major feature of this system is that it is possible to freely communicate with each other and to access the public network. The detailed configuration and operation will be described below.

(Structure of Main Unit) First, the structure of the main unit accommodating the public line will be described.

FIG. 6 is a diagram showing a system configuration and a main device configuration of the second embodiment. Reference numeral 1 denotes a main exchange for accommodating a plurality of outside lines and a plurality of terminals and exchanging calls between them. Main device, which is the main part of the system, 2 is a wireless terminal (a wireless telephone, which will be described later, and a data terminal to which a wireless adapter is connected)
Is a connection device that receives the control of the main device and wirelessly controls the wireless terminal so that the wireless communication path can be accommodated in the system.

Reference numeral 3 is a wireless telephone for communicating with an outside line accommodated in the main unit via the connection device 2 and for making an extension call with each other. Reference numeral 4 is a wireless adapter that enables wireless data transmission between similarly configured data terminals by connecting to a data terminal 5 such as a personal computer or a printer, an SLT (single telephone) 10, a facsimile 11, and an ISDN terminal 12. 6 is a PSTN (existing public network) that is one of the external networks accommodated in the main device 1, and 7 is a P
PSTN line which is an external line from the STN 6, 8 is the main unit 1
ISDN, which is one of the outside line networks accommodated in
It is an ISDN line which is an external line from 8. Reference numeral 10 denotes an SLT (single telephone) which is one of the terminals accommodated in the main device 1.

The internal structure of the main unit 1 will be described below. Reference numeral 201 denotes a CPU which is the center of the main unit 1 and controls the entire main unit including exchange control. 202 is the CPU 20
ROM storing the control program No. 1, 203 is a CP
The RAM stores various data for controlling the U201 and provides a work area for various calculations. 20
Reference numeral 4 is a call path unit that controls call exchange (time division exchange) under the control of the CPU 201, and 205 is PS under the control of the CPU 201.
PSTN line i that performs PSTN line control such as incoming call detection to accommodate a TN line, selection signal transmission, DC loop closure, etc.
/ F (interface). 206 is the CPU 20
ISDN for accommodating an ISDN line under control of 1
ISDN line i / f which supports Layer 1 and Layer 2 and performs ISDN line control. Reference numeral 207 denotes a telephone unit having a handset, dial keys, a call circuit, a display, etc., which functions as a dedicated telephone having a display, etc. under the control of the CPU 201 when energized, and performs only a call as an SLT when a power failure occurs. It is a thing. 208 is the CPU 201 when energized
Under the control of the above, it is an extension wireless telephone, and a wireless telephone section having a handset, a dial key, a call circuit, a display, etc., which functions as an SLT at the time of power failure. 209 is PB
(Push button) A tone sending circuit that sends out various tones such as signals, dial tone, and ring tone. 210 is the CPU 20
Under the control of 1, the connecting device 2 to accommodate the connecting device 2
And a connection device i / f for transmitting and receiving a call signal and a control signal.

(Structure of Connection Device) FIG. 7 is a diagram showing the structure of the connection device 2. Reference numeral 301 is the center of the connection device 2 and controls the connection device 2 as a whole including the control of the communication channel and the radio section. It is a CPU. 302 is a ROM storing the control program of the CPU 301, and 303 is an EEPR storing the calling code (system ID) of the exchange system.
An OM 304 is a RAM that stores various data for controlling the CPU 301 and provides a work area for various calculations. Reference numeral 305 denotes a main device i / f that transmits and receives a call signal and a control signal to and from the connection device i / f of the main device 1 under the control of the CPU 301. Reference numeral 306 denotes a PCM (pulse code modulation) from the main device 1 under the control of the CPU 301.
ADPCM (adaptive differe
P code for converting into a PCM code and transmitting the ADPCM coded speech signal from the channel codec 307 into the PCM code.
It is a CM / ADPCM converter. 307 is the CPU 301
Is a channel codec that performs processing such as scrambling on the ADPCM-encoded speech signal and control signal, and time-division and purifies them into a predetermined frame. Three
08 is a channel codec 3 under the control of the CPU 301.
A wireless unit that modulates a framed digital signal from 07 and processes it so that it can be wirelessly transmitted and transmits it to an antenna, and demodulates a signal wirelessly received from the antenna and processes it into a framed digital signal. Is.

(Structure of Radio Dedicated Telephone) FIG. 8 is a diagram showing the structure of the radio dedicated telephone 3, in which 401 is the whole of the radio dedicated telephone 3 including the radio unit control and the call control which are the core of the radio dedicated telephone 3. It is a CPU that controls the control. Reference numeral 402 denotes a ROM in which a control program for the CPU 401 is stored, 4
03 is a call code (system ID) of the exchange system,
EEPROM for storing the sub ID of the wireless telephone, 4
A RAM 04 stores various data for controlling the CPU 401 and provides a work area for various calculations. Reference numeral 405 is a call circuit that inputs and outputs a call signal from a handset 410, a microphone 411, and a speaker 412, which will be described later, under the control of the CPU 401. 406 is the CPU 4
Under the control of 01, the analog voice signal from the call circuit 405 is converted into an ADPCM code and transmitted to a channel codec 407 described later, and the ADPCM coded call signal from the channel codec 407 is converted into an analog signal to make a call. ADPCM codec for transmission to the circuit. 407 is an ADPC under the control of the CPU 401.
This is a channel codec that performs scrambling and other processing on M-coded speech signals and control signals, and time-division-multiplexes them into predetermined frames. 408, under the control of the CPU 401, modulates the framed digital signal from the channel codec 407, processes it so that it can be transmitted wirelessly, transmits it to the antenna, and demodulates the signal received wirelessly from the antenna to generate a frame. It is a wireless unit that digitizes and processes into digital signals. Reference numeral 410 is a handset for inputting and outputting a voice signal for communication, 411 is a microphone for collecting and inputting the voice signal, and 412 is a speaker for outputting the voice signal. A display unit 413 displays a dial number input from a key matrix to be described later and a usage status of an outside line. Reference numeral 414 is a key matrix composed of dial keys for inputting dial numbers and the like, and function keys such as an outside line key, a hold key, and a speaker key.

(Structure of Wireless Adapter) FIG. 9 is a diagram showing a structure of a data communication terminal that can be accommodated in the system and an internal block structure of a wireless adapter connected to the data terminal.

In the figure, 501 is a data terminal, and 50 is a data terminal.
2 is a wireless adapter, 503 is a wireless unit, and the data terminal 501 is connected to the wireless adapter 502 via a communication cable or an internal bus, such as a personal computer, a workstation, a printer, a facsimile,
Refers to other data terminal equipment.

Reference numeral 504 denotes a main control section, which is composed of a CPU, peripheral devices for controlling interrupts, DMA (direct memory access), etc., an oscillator for a system clock, etc., and controls each block in the wireless adapter.

Reference numeral 505 denotes a memory, which is composed of a ROM for storing programs used by the main control unit 504, a RAM used as a buffer area for various processes, and the like. Reference numeral 506 denotes a communication i / f unit, which is the data terminal 5 described above.
Communication i that is standard equipment of data terminal equipment such as 01
/ F, for example, communication i / f such as RS232C, Centronics, LAN, etc., internal bus of personal computer, workstation, for example, ISA bus, PCMCIA
i / f etc. correspond.

Reference numeral 507 denotes a terminal control unit for communication i / f5
It manages various communication controls required for data communication between the data terminal 501 and the wireless adapter 502 via 06.

Reference numeral 508 is a channel codec for performing frame processing and radio control, and its internal configuration is shown in FIG. The data assembled into frames by the channel codec is transmitted to the main device or the opposite terminal via the wireless unit.

An error correction processing unit 509 is used to reduce bit errors occurring in data by wireless communication. At the time of transmission, an error correction code is inserted in the communication data. Further, at the time of reception, an error position and an error pattern are calculated by arithmetic processing, and a bit error in the received data is corrected.

A timer 510 provides a timing signal used by each block inside the wireless adapter.

FIG. 10 shows the configuration of a modem built-in type wireless adapter which is required when data is transmitted to a public line. In the figure, 511 is a modem for modulating data into a voice band signal, and 512 is an ADPCM codec for encoding the signal modulated by the modem.
The ADPCM encoded data is assembled into a frame by the channel codec and transmitted to the main device via the wireless unit.

(Structure of Radio Unit) FIG. 11 is a diagram showing the structure of a radio unit commonly used by the main unit of this system, a telephone dedicated to radio, and a data terminal. 601a and 601b are antennas for transmission and reception, and 602 is an antenna. 601 changeover switch,
Reference numeral 603 is a band pass filter (hereinafter referred to as BPF) for removing an unnecessary band signal, 604 is a transmission / reception changeover switch, 605 is a receiving amplifier, 606 is a transmitting amplifier (with power control), and 607 is 1st.
IF (intermediate frequency) down converter, 608 is an up converter, 609 is a transmission / reception changeover switch, 6
Reference numeral 10 is a BPF for removing a signal in an unnecessary band from the signal converted by the down converter 607, 6
11 is a down converter for 2nd.IF, 60
7, 611 constitutes a double-conversion system reception form.

612 is a BPF for 2nd.IF, 613 is a 90 ° phase shifter, 614 is a quadrature detector 612,
The signal received by 613 is detected and demodulated.

Reference numeral 615 denotes a waveform shaping comparator, 61
6 is a voltage control type oscillator (hereinafter referred to as VCO) of the receiving system, 6
17 is a low-pass filter (LPF), 618
Is a phase lock loop (PLL) composed of a programmable counter, prescaler, phase comparator, etc. 616,
617 and 618 form a frequency synthesizer for the receiving system.

Reference numeral 619 denotes a VCO for generating a carrier signal, 6
20 is an LPF, 621 is a PLL composed of a programmable counter, a prescaler, a phase comparator, etc. 61
A frequency synthesizer for hopping is constituted by 9, 620 and 621.

Reference numeral 622 is a transmission system VC having a modulation function.
O, 623 are LPFs, 624 is a PLL composed of a programmable counter, prescaler, phase comparator, etc.
With 622, 623 and 624, a frequency synthesizer of a transmission system having a frequency modulation function is configured.

625 is various PLLs 618, 621, 62
4 is a reference clock, and 626 is a band limiting filter for transmission data (baseband signal).

Reference numeral 626 is a carrier detector for detecting a transmission request carrier in the received signal.

The operation of this radio section will be described below.

1. During transmission, data (digital data) input from an external circuit such as a processor is band-limited by a baseband filter 626 and then input to a modulation terminal of a transmission system VCO 622.

The transmission system VCO 622 is a transmission system PLL 624.
And the frequency is determined by the control voltage output from the circuit of the LPF 623, and the modulated wave of the intermediate frequency (IF) is generated by the direct modulation.

The intermediate frequency (IF) modulated wave generated by the frequency synthesizers 622, 623 and 624 is input to the up converter 608, and the VCO 619, LP
After being added to the carrier signal generated by the frequency synthesizer composed of F620 and the hopping PLL, it is input to the transmission system amplifier 606.

The signal amplified to a predetermined level by the transmission system amplifier 606 has a signal in an unnecessary band removed by a BPF 603, and then emitted from an antenna 601 as a radio wave into space.

2. At the time of reception The signal received by the antenna 601 is amplified to a predetermined level by the reception system amplifier 605 after the unnecessary band signal is removed by the BPF 603.

The received signal amplified to a predetermined level has its carrier signal removed by the down converter 607 for 1 s.
Converted to a frequency of t.IF.

The received signal of 1st.IF is input to the down converter 611 for 2nd.IF after the unnecessary band signal is removed by the BPF 610.

The down converter 611 is the VCO 616,
A signal having a frequency of 2nd.IF is generated by the signal generated by the frequency synthesizer including the LPF 617 and the receiving system PLL 618 and the input signal from the 1st.IF.

The received signal down-converted to the frequency of 2nd.IF is inputted to the 90 ° phase shifter 613 and the quadrature detector 614 after the unnecessary band signal is removed by the BPF 612.

The quadrature detector 614 performs detection and demodulation using the signal whose phase is shifted by the 90 ° phase shifter 613 and the original signal.

The data (analog data) demodulated by the quadrature detector 614 is waveform-shaped as digital data by the comparator 615 and output to an external circuit.

The received signal that has passed through the BPF 612 is branched and the carrier is detected by the carrier detector 626.

(Wireless Frame) FIGS. 12 to 18 show the structure of a wireless frame used in this system.

In this system, "main device-wireless dedicated telephone communication frame" (hereinafter abbreviated as PCF), "wireless dedicated telephone communication frame" (hereinafter abbreviated as PPF),
"Burst data frame" (hereinafter abbreviated as BDF) 3
Use two different frames. The details of the internal data of each frame will be described below.

FIG. 12 shows the PCF. In the figure, F
SYN is a synchronization signal, LCCH-T is a logical control channel sent from the main device to the wireless dedicated telephone, LCCH-R is a logical control channel sent from the wireless dedicated phone to the main device,
T1, T2, T3, T4 are voice channels sent to four different wireless dedicated telephones, R1, R2, R3, R4 are voice channels transmitted from four different wireless dedicated telephones,
GT represents guard time. Also, in the figure, F1,
F3 is a frequency channel used when wirelessly transmitting this frame, and indicates that the frequency channel is changed for each frame.

FIG. 13 shows the PPF. In the figure, F
SYN is a synchronization signal, LCCH-T is a logical control channel sent from the main device to the wireless dedicated telephone, LCCH-R is a logical control channel sent from the wireless dedicated phone to the main device,
T1, T2, T3 are voice channels sent to three different wireless dedicated telephones, R1, R2, R3 are voice channels transmitted from three different wireless dedicated telephones, and GT is a guard time. Also, in the figure, F1, F3, F5
F7 is a frequency channel used when wirelessly transmitting this frame. Unlike PCF, F7 is a frequency channel.
After receiving the logical control information LCCH-T from the main device, the frequency channel is switched to F5 which is secured for communication between wireless dedicated telephones, and communication between wireless dedicated telephones is performed. After that, the procedure of switching the frequency channel to F3, receiving the logical control information from the main device, and switching the frequency channel to F7 secured for the communication between wireless dedicated phones is repeated until the communication between the wireless dedicated phones is completed.

FIG. 14 shows the BDF. In the figure, F
SYN is a synchronization signal, LCCH-T is a logical control channel sent from the main unit to the wireless telephone, GT is a guard time, CS1 to 3 are time slots for issuing a carrier for transmission request, and R is the end of the previous frame. The time of carrier sense for confirming that the other wireless device is not emitting a radio wave, PR1 is the preamble, D
ATA represents a data slot accommodating burst data. Also, in the figure, F1, F3, F5, and F7 are frequency channels used when wirelessly transmitting this frame, and unlike PCF, after receiving logical control information from the main device in F1, The frequency channel is switched to F5, which is secured for burst data communication, and communication between wireless dedicated telephones is performed. After that, the procedure of switching the frequency channel to F3, receiving the logical control information from the main device, and switching the frequency channel to F7 secured for burst data communication is repeated until the burst data communication is completed.

FIG. 15 shows an FSYN frame. In the figure, PR is a 62-bit preamble for frequency synchronization acquisition, SYN is a 31-bit frame synchronization signal,
ID is a 63-bit calling signal, FI is a 2-bit channel type signal that distinguishes PCF / PPF / BDF, TS is time slot information, and NFR is frequency information of the next frame. The numbers in the figure show the number of bits in the second embodiment.

FIG. 16 shows a frame of a voice channel.
Since the configurations of T1, T2, T3, T4, R1, R2, R3 and R4 are common, the transmission voice channels will be collectively referred to as Tn and the reception voice channels will be collectively referred to as Rn. The configurations of Tn and Rn are also common. In the figure, R is the time of carrier sense for confirming that the previous frame has ended and for confirming whether another wireless device is emitting radio waves, PR1 is a preamble for each slot, and UW is a subamble. Unique word including ID, D
Is 3.2 kbps D channel information, B is 32 kbps
B channel information, GT represents the guard time. Also,
The numbers in the figure indicate the number of bits in the second embodiment.

FIG. 17 shows the frame structure of the logical control channel LCCH-T. LCCH-T is a logical control channel sent from the main unit. In the figure, UW is a unique word including a sub ID, LCCH is logical control information,
GT represents guard time. Since LCCH-T is sent continuously after sending FSYN, no preamble or the like is added.

FIG. 18 shows the frame structure of the logical control channel LCCH-R. LCCH-R is a logical control channel sent from the wireless-only telephone to the main unit. In the figure, R is the time of carrier sense for confirming that the previous frame has ended and for confirming whether another wireless device is emitting radio waves, PR1 is a preamble for each slot, and UW is a subamble. A unique word including an ID, LCCH represents logical control information, and GT represents a guard time.

(Channel Codec) The above frame is processed by the channel codec. FIG. 19 shows the internal structure of the channel codec. In the figure, 80
1 is a channel codec, 802 is a wireless unit, 803 is an ADPCM codec built into a wireless telephone, etc.,
Reference numeral 804 is a CPU of a wireless telephone or a wireless adapter. Inside the channel codec 801, 80
A wireless control unit 5 controls the wireless unit to control transmission / reception switching and frequency hopping. Further, it also has a function of performing carrier detection prior to data transmission. 807
Is an i / f for exchanging control information with the CPU
That is, each part of the ASIC is controlled according to the state of each part in the ASIC. Reference numeral 806 denotes an ADPCM codec i / f, which exchanges serial data and a synchronous clock for exchanging a voice signal with the ADPCM codec. A transmission frame processing unit 808 assembles signals from the ADPCM codec and logical control data input from the CPU into the transmission frames shown in FIGS. 12 to 18. A reception frame processing unit 809 extracts control information and audio data from a frame of a signal from the wireless unit, and uses the ADPCM codec i / f and the CPU.
Pass to i / f. 810 is a DPLL (delay phase locked)
loop), which is a synchronization processing unit that reproduces the clock from the received signal and captures bit synchronization.

The basic operation of this ASIC will be described below.

1. Transmission Control information to be added to the transmission data frame from the CPU C
Received by PUi / f. ADPC if the ASIC is used in wireless-only telephones and connection devices in the main unit
The transmission frame processing unit assembles the transmission frame together with the data from the M codec. When the ASIC is used in the data terminal, the transmission frame processing unit assembles the transmission frame together with the error-correction-coded burst data. When assembling the frame, the data is scrambled. This is necessary to maintain DC balance during wireless transmission. The radio control unit takes the timing at which the reception signal ends and, after carrier sensing, puts the radio unit into a transmission state and passes the transmission frame to the radio unit.

2. The reception wireless control unit switches the wireless unit to the reception state when the data to be transmitted is completed, and waits for a reception frame. When the received frame is received, the control information and the data are extracted from the received frame after descramble the data. The control information is passed to the CPU via the CPU I / f.

When the received frame is PCF or PPF, the received data is ADPCM codec i /
If it is a wireless telephone, it is output as voice through the ADPCM codec, and if it is the main device, it is sent to the communication path.

When the received frame is BDF, the received data is transferred to the memory in the data terminal.

3. Handling of logical control data (3-1) During non-communication Standby at the frequency assigned by the main device in advance, and receives LCCH-T from the main device that is sent periodically. At this time, in the LCCH sent from the main unit,
It contains information such as whether there is an outside line call or whether there is a call request on the wireless telephone side. The wireless telephone sends the LCCH extracted by the received frame processing unit to the CPU. After that, the LCC sent to the main unit instructed by the CPU
Send H to the main unit on LCCH-R in the same frame. Thus, the wireless-only telephone repeats this procedure until an outgoing call or an incoming call occurs.

(3-2) At the time of communication A case where the wireless telephone A makes a call will be described as an example.
It is assumed that the wireless telephone A exchanges the LCCH with the main device on the frequency channel F1 during non-communication. The wireless telephone A monitors the LCCH from the main unit on the frequency channel F1 by the procedure described in (3-1) until a call is made. When a call is made on the wireless telephone A,
In the procedure of (3-1), a call request is put in the LCCH-R sent to the main unit and sent to the main unit. The LCCH that informs whether communication is possible from the main unit side is determined by the LCCH sent on the frequency channel F1 after 100 ms.

If the contents of the LCCH from the main unit after the call request indicates that the line is full and connection cannot be made,
The wireless telephone A informs the user that the telephone is busy.

If the contents of the LCCH from the main unit after the call request is shown to be connectable, the same LCCH-
Within T, the time slot of the voice channel used in the call is specified. For example, if "1" is instructed, it means that communication is performed using T1 and R1. Communication is performed while switching frequency channels according to the frequency hopping pattern specified by FS and NFR in the FSYN frame. The exchange of control information after connecting to the main device is performed by the D channel information in the Tn and Rn frames.

In the case of the communication between the wireless dedicated telephones, the control information between the wireless dedicated telephones is performed by the D channel information, and after completion of the communication, each wireless dedicated telephone uses the LCCH-R of the designated frequency channel, that is, in the case of the previous example. Wireless dedicated phone A
Notifies the main device that the communication between the wireless-dedicated telephones has ended when the control information is exchanged with the main device on the frequency channel F1 during non-communication.

(Regarding Frequency Hopping Pattern) FIG. 20 shows a conceptual diagram of frequency hopping used in this system.

In the system of this embodiment, 26 frequency channels of 1 MHz width using the 26 MHz band are used. Considering the case where there is a frequency that cannot be used due to interference noise or the like, 20 frequency channels are selected from 26 channels, and frequency hopping is performed on the selected frequency channels in a predetermined order.

In this system, one frame has a length of 5 ms, and the frequency channel is hopped for each frame. Therefore, the length of one cycle of one hopping pattern is 100 ms.

In the figure, different hopping patterns are shown as different patterns. In this way, by using a pattern in which the same frequency is not used at the same time in each frame, it is possible to prevent the occurrence of data error or the like.

Further, when accommodating a plurality of connecting devices, it is also a feature of this system that different connecting devices use different hopping patterns in order to prevent interference between the connecting devices. With this method, a system having a multi-cell configuration can be realized and a wide service area can be obtained.

(Explanation of Detailed Operation) As described above, in the present system, frames are assembled for communication between the main unit and the wireless telephone or data terminal, and between terminals, and the frequency to be used is fixed for a certain time. The control is switched for each.

The specific operation of this system will be described below in some cases.

1. Basic operating procedure In this system, before using the communication channel,
It is characterized in that the slot and the hopping pattern to be used are determined by using the logical control channels (LCCH-T and LCCH-R) which are time division multiplexed within the frame. Furthermore, in order for each terminal to perform intermittent reception and enable battery saving, each terminal is designed to transmit and receive only on a logical control channel that transmits at a frequency assigned in advance.

However, immediately after the power is turned on, the terminal does not recognize the hopping pattern. Therefore, it waits at an arbitrary frequency and receives a frame at that frequency. When the first frame is received, the frequency information of the next frame contained in it is fetched, and frequency hopping is started. If multiple attached devices are used,
It follows the hopping pattern used by the connecting device that was able to receive the frame for the first time.

Immediately after the power is turned on, which terminal is assigned to which frequency is not determined. Therefore, when the power is turned on, the ID of each terminal is registered and the logical control channel frequency is assigned in the setting mode.

When the logical control channel is assigned,
Each terminal is in the discontinuous reception state and receives only the logical control data addressed to itself. Also, only when data to be transmitted to the main device occurs, LCCH-of the assigned frequency
Send data to the master using R.

When it is desired to start the communication using the call slot, the logical control channel must be used to notify the main device of that fact and the slot and hopping pattern must be assigned. After making those assignments,
It becomes possible to make calls and transmit data.

The detailed operation in some cases will be described below.

2. 21. Processing during extension communication between wireless data terminals FIG. 21 shows a control data sequence of the extension communication main device, connection device, calling side communication terminal, and called side communication terminal.
2 shows an outline processing flow of the main device, FIG. 23 shows an outline processing flow of the calling side communication terminal, and FIG. 24 shows an outline processing flow of the called side communication terminal. However, in the processing flow, only the relevant processing part is described.

When the wireless terminal 104-A requests data transmission (S2301), the wireless terminal 104-A
Transmits an extension communication signal (2102) on the wireless link between the wireless terminal 104-A and the connection adapter 2 using LCCH-R of the PCF frame shown in FIG. 12 (S230).
2). The connection device 2 sends the extension communication signal (210
When 2) is received, the main device is notified.

The extension communication (2101) is received (S220
1) The CPU 201 in the main device analyzes the terminal attributes and the like of the wireless terminal 104-A that made the call, and if the extension call is possible (S2202), the LCCH-T of the PCF frame.
Is transmitted to the wireless terminal 104-A via the connection device 2 as an extension communication permission using (2103) (S2204).
Next, an extension communication permission signal from the main device is received (S230
The wireless terminal 104-A which has performed 3) receives the dial information and transmits the dial information (2108) to the main device 1 (S23).
04). The final dial is monitored for timeout.

In the main unit 1, dial information (2107)
Is received (S2205), the dial is analyzed, and the extension incoming call (2109) is transmitted to the wireless terminal 104-E via the connection device 2 using the LCCH-T of the PCF frame (S2206).

Upon receiving the extension incoming signal (2110), the wireless terminal 104-E sends the connection signal (2112) to the connection device using the LCCH-R of the PCF frame and notifies the main device (S2402).

Connection from the wireless terminal 104-E (211)
The main device 1 that received 2) receives the wireless terminal 1 (S2207).
The wireless terminal 1 transmits the extension response (2113) to 04-A.
Notify that 04-E has responded. This extension response (2
113), the CPU 201 in the main device has the RAM 20
The communication resources such as empty time slots and hopping patterns stored and managed in FIG. 3 are assigned to the direct communication between the wireless terminals 104-A and 104-E, and this communication resource information is used by the LCCH-T of the PCF frame. As the extension response (2103), the wireless terminal 10 is transmitted via the connection device 2.
It transmits to 4-A (S2208).

Upon receiving the extension response signal, the wireless terminal 104-A uses the LCCH-R to complete the connection completion signal (210
6) is transmitted (S2306). The connection device 2 notifies the main device 1 of the connection completion command (2105) from the wireless terminal 104-A.

At the same time, the main unit 1 also transmits an extension communication permission (2115) including communication resource information such as a hopping pattern used for direct communication to the wireless terminal 104-E (S2208).

The radio terminal 104-A, which has confirmed the partner's response by the extension response signal (2114), is in the communication state with the communication partner. On the other hand, the wireless terminal 104-E that has received the extension communication permission signal (2216) receives the extension communication permission signal (271).
6) In synchronization with the hopping pattern obtained from the communication resource information in 6), the connection completion signal (2
118) is transmitted.

That is, during the subsequent direct communication between wireless terminals, the communication is performed in the BDF frame shown in FIG.

When the main unit 1 receives the connection completion (2117) from the wireless terminal 104-E (S220).
9), determine that the wireless terminal 104-A and the wireless terminal 104-E have started communication, and wait for the end of extension communication (S221).
0).

When the communication is completed and the wireless terminal 104-A detects the completion (S2309), the wireless terminal 104-A sends an end command to the wireless terminal 104-E (S231).
0). When the wireless terminal 104-E receives the end command from the wireless terminal 104-A (S2406), the wireless terminal 1
An end confirmation command is transmitted to 04-A (S240).
7). Upon receiving the end confirmation command (S2311), the wireless terminal 104-A sends the extension communication end signal (212) to the main unit 1.
3) is transmitted (S2312).

When the main unit 1 receives the extension communication end signal (S2210), it sends a disconnection signal (2125).
04-A and the wireless terminal 104-E (S221).
1).

Upon receiving the disconnection signal (2120), the wireless terminal 104-E transmits a disconnection confirmation signal (2121) as control information in the communication channel.

Further, the wireless terminal 104-A which has received the disconnection confirmation signal (2121) switches the communication channel to the logical control channel and transmits the extension communication end signal (2123) to the connection adapter 2. The extension communication end (2102) is transmitted to the main device 1, and the disconnection (2124) is transmitted to the wireless terminal 104-A. Similarly, the main device 1 also transmits a disconnection (2126) to the wireless terminal 104-E (S2211).

Next, the main unit 1 releases the communication resources assigned to the wireless terminal (S2212). The wireless terminal 104 that has received the disconnection signal (2125, 2127)
-A and 104-E release resources.

A data transmission flowchart of the caller side wireless terminal when the caller side wireless terminal 104-A and the callee side wireless terminal 104-E transmit data after the call setup is performed between the main unit and the wireless terminal by the above procedure. FIG. 25 shows a data transmission flowchart of the receiving side wireless terminal, and FIG. 27 shows a carrier transmission state using a carrier transmission time difference.

Incidentally, in the embodiment, the transmitting side wireless terminal 104-
It is assumed that the wireless terminals are prioritized in advance so that A can preferentially transmit data to the called wireless terminal 104-E.

That is, when the transmitting side wireless terminal 104-A has transmission data, the carrier is transmitted at the timing of time T in FIG. 25, and when the receiving side wireless terminal 104-E has transmission data, the transmission time is t. The carrier for transmission request is transmitted at a timing (T <t).

When there is transmission data in the originating wireless terminal 104-A (S2501), the carrier for the timing transmission request at time T in FIG. 27 is taken out (S2502) and then the data is transmitted (S2503). Then, it is checked whether or not there is a disconnection request from the terminal side (S2504), and if there is a disconnection request, the communication is disconnected according to the above disconnection procedure. If there is no disconnection request, the process returns to S2501.

When there is transmission data in the receiving side wireless terminal 104-E (S2601), the carrier for transmission request is output at the timing t in FIG. 27 (S2602), and the time t is displayed in the collision detection window in FIG. It is detected whether there is a carrier for transmission request before (S2603). When the carrier for transmission request transmitted at the timing of time T (T <t) is detected in the collision window (S2604), 1
Waiting for a cycle (S2605) and returning to step S2602.
If there is no transmission request carrier transmitted at the timing of time T (S2604), the receiving-side wireless terminal 104-E
Transmits the data (S2606). Then, it is checked whether or not there is a disconnection request from the terminal side (S2607), and if there is a disconnection request, communication is disconnected according to the above disconnection procedure. The above operation is performed every time the frequency changes.

As described above, since the person who has transmitted the carrier for the transmission request first can transmit the data, the data of the transmitting side wireless terminal can be preferentially transmitted.

In the second embodiment, the description has been given so that the wireless terminal on the calling side can transmit data preferentially to the wireless terminal on the called side. However, the wireless terminal on the calling side sends a carrier at time t and receives a call. It is also possible to allow the receiving-side wireless terminal to preferentially transmit data by presetting the transmitting-side wireless terminal to transmit the carrier at time T (T <t).

Further, even a terminal which transmits a carrier at time t is configured to transmit a carrier at time T1 such that 0 <T1 <T <t, so that data is transmitted preferentially. be able to. In order to transmit the carrier at this time T1, each wireless terminal has a switch for transmitting data to be preferentially transmitted, or if there is data to be preferentially transmitted, the wireless terminal It is realized by allowing the operator to enter a command for priority data.

FIG. 28 shows a carrier transmission state using a time slot, FIG. 29 is a data transmission flowchart of the transmission side wireless terminal when the time slot is used, and FIG. 30 is a receiving side wireless terminal when the time slot is used. A data transmission flowchart of is shown as a third embodiment. Further, since the system configuration and the configuration of each device are the same as those in the second embodiment,
The description is omitted.

In the third embodiment, the originating wireless terminal 104-
A has a higher priority than the called wireless terminal 104-E,
When the originating wireless terminal 104-A wants to transmit data, the carrier for transmission request is issued in the CS2 time slot (Fig. 23 * 1), and the receiving wireless terminal 104-E wants to transmit data. , CS3, a carrier for transmission request is issued in the time slot (FIG. 28 * 2), and further, both ends of the transmitting side wireless terminal 104-A and the receiving side wireless terminal 104-E have data to be transmitted with the highest priority. Is CS
It is assumed that a carrier for transmission request is issued in one time slot (Fig. 28 * 3).

The priority of this wireless terminal is set in advance so that the calling side has a higher priority than the called side, and the called side may have a higher priority than the calling side. .

In addition, a switch for transmitting the highest priority data is installed in the wireless terminal, the switch is turned on, a command for transmitting the highest priority data is input to the wireless terminal, and CS1 is selected depending on the type of data. The carrier for the transmission request may be output in the time slot (* 3 in FIG. 28).

After setting the call between the main unit and the wireless terminal, the calling side wireless terminal 104-A and the called side wireless terminal 10 will be described.
The operation when 4-E uses the time slot to perform data transmission will be described.

When there is transmission data (S2901), the transmission-side wireless terminal 104-A determines whether the data has a high priority (S2902), and if it is normal data, carries out carrier sense in the CS1 time slot (S2906). ), If there is no transmission request carrier (S2907), the transmission request carrier in the CS2 time slot (FIG. 28 * 1)
Is output (S2908), and then data is transmitted (S2
904). Then, it is checked whether or not there is a disconnection request from the terminal side (S2905), and if there is a disconnection, the communication is disconnected according to the above disconnection procedure. If there is a carrier in step S2907 (S2907), one cycle is waited (S2909), and carrier sense is performed again (S2906).

If it is determined in step S2902 that the data has a high priority, a carrier for transmission request is issued in the CS1 time slot (* 3 in FIG. 28) (S29).
03) and data transmission (S2904). Then, it is checked whether or not there is a disconnection request from the terminal side (S2905), and if there is a disconnection, the communication is disconnected according to the above disconnection procedure.

When there is transmission data (S3001), the receiving side wireless terminal 104-E judges whether or not the data has a high priority (S3002), and if it is normal data, CS1, C
Carrier sense is performed in the time slot of S2 (S300
6) If there is no transmission request carrier (S300
7), a carrier for transmission request (Fig. 28 * 2) is output in the CS3 time slot (S3008), and then data transmission is performed (S3004). Then, it is checked whether or not there is a disconnection request from the terminal side (S3005), and if there is a disconnection, communication is disconnected according to the above disconnection procedure. Also, step S3007
If there is a carrier in (S3007), wait for one cycle (S3
009), and carrier sense is performed again (S3006).

If it is determined in step S3002 that the data has a high priority, a carrier for transmission request is issued in the CS1 time slot (* 3 in FIG. 28) (S30).
03), and then data transmission (S3004). Then, it is checked whether there is a disconnection request from the terminal side (S300
5) If there is, communication is disconnected according to the above disconnection procedure.

As described above, even the data of the receiving side wireless terminal having a low priority can be preferentially transmitted if the data has a high priority.

Also, in the second and third embodiments, the description has been made assuming that the calling side wireless terminal has a higher priority than the receiving side wireless terminal, but the receiving side wireless terminal has a higher priority order. It may be high, and the priority of the wireless terminal and the priority of the data can be arbitrarily set.

Further, in the third embodiment, there are three time slots for sending out a carrier for transmission request, namely CS1, CS2 and CS3, but it is also possible to provide a plurality of time slots and further set the priority of data. It is possible.

It goes without saying that the present invention can also be applied to the case where it is achieved by supplying a program to a system or an apparatus.

In the first and second embodiments, the radio communication is performed by using the frequency hopping method, but it is also possible to perform the communication by using the direct spreading method.

[0146]

As described above, according to the present invention,
It is possible to improve the convenience of data transmission in which data transmission can be performed according to the priority of transmission data. Immediately after the communication of the other communication device is completed, the transmission request of the other communication device is detected at the time of detecting the transmission request determined by the priority order of the data, so that the carrier collision for the transmission request can be prevented. It can be lost.

[0147]

[Brief description of drawings]

FIG. 1 is a block diagram illustrating an outline of a configuration of a wireless communication device according to a first embodiment.

FIG. 2 is a diagram showing carrier transmission states of a plurality of terminals of the wireless communication device of the first embodiment.

FIG. 3 is a diagram showing a case where carriers of respective terminals of the wireless communication device of the first embodiment collide.

FIG. 4 is a flowchart showing data transmission of the wireless communication device of the first embodiment.

FIG. 5 is a block diagram showing a schematic configuration of a wireless communication system according to a second embodiment.

FIG. 6 is a block diagram showing a configuration of a main device of a wireless communication system according to a second embodiment.

FIG. 7 is a block diagram showing a configuration of a connection device of a wireless communication system according to a second exemplary embodiment.

FIG. 8 is a block diagram showing the configuration of a wireless dedicated telephone of the wireless communication system according to the second embodiment.

FIG. 9 is a block diagram showing a configuration of a wireless adapter of a wireless communication system according to a second exemplary embodiment.

FIG. 10 is a diagram showing a configuration of a wireless adapter with a built-in modem of a wireless communication system according to a second embodiment.

FIG. 11 is a block diagram showing a configuration of a wireless unit of a wireless communication system according to a second embodiment.

FIG. 12 is a diagram showing a frame structure used for communication between a main device and a slave unit of a wireless communication system according to a second embodiment.

FIG. 13 is a diagram showing a frame structure used for inter-slave unit communication in the wireless communication system of the second embodiment.

FIG. 14 is a diagram showing the structure of a burst data frame of the wireless communication system of the second embodiment.

FIG. 15 is a diagram showing a structure of a synchronization signal of the wireless communication system in the second example.

FIG. 16 is a diagram showing a configuration of a voice channel of a wireless communication system according to a second embodiment.

FIG. 17 is a diagram showing the configuration of a logical control channel sent from the main device of the wireless communication system of the second embodiment to the wireless dedicated telephone.

FIG. 18 is a diagram showing a configuration of a logical control channel sent from a wireless-only telephone to a main device of a wireless communication system according to a second embodiment.

FIG. 19 is a block diagram showing a configuration of a channel codec of the wireless communication system of the second example.

FIG. 20 is a diagram showing a conceptual diagram of frequency hopping used in the wireless communication system of the second embodiment.

FIG. 21 is a diagram showing an extension communication sequence of a wireless communication system according to a second embodiment.

FIG. 22 is a flowchart showing the operation of the main device during extension communication of the wireless communication system of the second example.

FIG. 23 is a flowchart showing an operation of the wireless terminal when an extension call is made in the wireless communication system of the second example.

FIG. 24 is a flowchart showing an operation of the wireless terminal when an extension call is received in the wireless communication system of the second embodiment.

FIG. 25 is a flowchart showing an operation of the transmitting side wireless terminal of the wireless communication system of the second exemplary embodiment during data transmission.

FIG. 26 is a flowchart showing an operation at the time of data transmission of the receiving-side wireless terminal of the wireless communication system of the second example.

FIG. 27 is a diagram showing a carrier transmission state using a time difference in the wireless communication system of the second example.

FIG. 28 is a diagram showing a carrier transmission state using time slots in the wireless communication system of the third example.

FIG. 29 is a flowchart showing an operation of the transmitting side wireless terminal of the wireless communication system of the third exemplary embodiment at the time of data transmission.

FIG. 30 is a flowchart showing an operation at the time of data transmission of the receiving-side wireless terminal of the wireless communication system of the third example.

Claims (62)

[Claims] 1. A wireless communication device for wireless communication between a plurality of data terminals, setting means for setting a time for detecting a transmission request from another wireless communication device according to a priority of data to be transmitted, Detecting means for detecting a transmission request from the wireless communication device and the other detecting means does not transmit data, the detecting means detects the predetermined time set by the setting means, and as a result, And a transmitting means for transmitting data after transmitting a transmission request based on the above. 2. The detection means detects a carrier transmitted as a transmission request, and when no carrier is detected within the time set by the setting means, there is no transmission request from another wireless communication device. The wireless communication device according to claim 1, wherein 3. The wireless communication device according to claim 1, wherein the setting unit also sets a transmission interval of a carrier that transmits a transmission request. 4. The wireless communication device according to claim 1, wherein the setting unit randomly sets a time for detecting a transmission request from another wireless communication device within a predetermined time. 5. A wireless communication device that performs data communication after wirelessly linking with another wireless communication device, and a communication frame for detecting a transmission request from another wireless communication device according to the priority of data to be transmitted. Setting means for setting the slot position in the, the detection means for detecting the transmission request from the other wireless communication device, the detection means performs the detection of the transmission request in the slot set by the setting means, A wireless communication device comprising: a transmission unit that transmits a transmission request based on a result and transmits data. 6. The detecting means detects a carrier transmitted as a transmission request in a slot in a communication frame, and when there is no carrier in the slot, there is no transmission request from the other wireless communication device. The wireless communication device according to claim 5, wherein the determination is made. 7. The setting means also sets a slot in a communication frame for transmitting a carrier to be transmitted as a transmission request, and the transmitting means transmits the carrier to the slot set by the setting means. The wireless communication device according to claim 5, which is characterized in that. 8. The wireless communication apparatus according to claim 5, wherein the setting unit allocates slots in the communication frame between the calling side wireless communication apparatus and the called side wireless communication apparatus. 9. The radio according to claim 8, wherein the setting means assigns a high priority to the calling side wireless communication device and a low priority to the called side wireless communication device to a slot in the communication frame. Communication device. 10. The radio according to claim 8, wherein the setting means assigns a high priority to the called side wireless communication device and a low priority to the calling side wireless communication device to a slot in the communication frame. Communication device. 11. The wireless communication apparatus according to claim 7, wherein the setting unit sets a special slot in the communication frame for data to be transmitted particularly preferentially. 12. The wireless communication device according to claim 5, wherein the transmitting means performs transmission using a direct spreading method. 13. The wireless communication device according to claim 5, wherein the transmitting means performs transmission using a frequency hopping method. 14. A switching system comprising a main device having a switching function and a wireless communication device for performing communication between wireless communication devices after the wireless link is established by the main device, according to a priority order of data to be transmitted. Setting means for setting a slot in a communication frame for detecting a transmission request from the other wireless communication device, detection means for detecting a transmission request from the other wireless communication device, and the detection means set by the setting means And a transmission means for detecting a transmission request in the slot, transmitting a transmission request based on the result, and transmitting data. 15. The detection means detects a carrier transmitted as a transmission request in a slot in a communication frame, and when there is no carrier in the slot, determines that there is no transmission request from the other wireless communication device. 15. The exchange system according to claim 14, wherein: 16. The setting means also sets a slot in a communication frame for transmitting a carrier transmitted as a transmission request as a transmission request, and the transmission means sets the carrier in the slot set by the setting means. 15. The exchange system according to claim 14, wherein the exchange is made. 17. The exchange system according to claim 14, wherein the setting unit sets a slot in the communication frame by the calling side wireless communication device and the called side wireless communication device. 18. The setting unit assigns a high priority to a calling side wireless communication device and a low priority to a called side wireless communication device to slots in a communication frame. Exchange system. 19. The method according to claim 17, wherein the setting means assigns a high priority to the called side wireless communication device and a low priority to the calling side wireless communication device to slots in the communication frame. Exchange system. 20. The exchange system according to claim 15, wherein the setting unit sets a special slot in the communication frame for data to be transmitted particularly preferentially. 21. The exchange system according to claim 14, wherein said transmitting means performs transmission using a direct spreading method. 22. The exchange system according to claim 14, wherein said transmitting means performs transmission using a frequency hopping method. 23. In a wireless communication method of wirelessly communicating between a plurality of data terminals, when another wireless communication device is not transmitting data, the other communication device transmits the data according to the priority order of the data. Set the time to detect the transmission request, detect the transmission request from other communication devices during the set time, and send the transmission request based on the result, and then transmit the data. A wireless communication method comprising. 24. The detecting step detects a carrier transmitted as a transmission request, and determines that there is no transmission request from another wireless communication device when the carrier is not detected within a set time. 24. The wireless communication method according to claim 23. 25. The wireless communication method according to claim 23, wherein the setting step also sets a transmission interval of a carrier transmitting as a transmission request. 26. The wireless communication method according to claim 23, wherein the setting step randomly sets a time for detecting a transmission request from another wireless communication device within a predetermined time. 27. The wireless communication device according to claim 1, wherein the setting unit sets a short time for detecting a transmission request from another wireless communication device when the transmission priority is high. 28. The wireless communication method according to claim 23, wherein in the setting step, when a transmission priority is high, a time for detecting a transmission request from another wireless communication device is set to be short. 29. A wireless communication method for performing data communication after wirelessly linking with another wireless communication device, the communication frame detecting a transmission request from another wireless communication device according to a priority of data to be transmitted. Each step of setting the slot position in the inside, detecting whether there is a transmission request from the other wireless communication device in the set slot, and transmitting a transmission request and transmitting data based on the result A wireless communication method comprising: 30. The detecting step detects a carrier transmitted as a transmission request in a slot in a communication frame, and when there is no carrier in the slot, determines that there is no transmission request from the other wireless communication device. 30. The wireless communication method according to claim 29, wherein: 31. The setting step also sets a slot in a communication frame for transmitting a carrier transmitted as a transmission request, and the transmitting step transmits a carrier in the set slot. The wireless communication method according to claim 29. 32. The wireless communication method according to claim 29, wherein in the setting step, a slot in a communication frame is set between the calling side wireless communication device and the called side wireless communication device. 33. The setting step assigns a high priority to a calling side wireless communication device and a low priority to a called side wireless communication device to a slot in a communication frame. Wireless communication method. 34. The setting step assigns a high priority to a called side wireless communication device and a low priority to a calling side wireless communication device to a slot in a communication frame. Wireless communication method. 35. The wireless communication method according to claim 31, wherein in the setting step, a special slot is set in the communication frame for data to be transmitted particularly preferentially. 36. The wireless communication method according to claim 29, wherein in the transmitting step, transmission is performed using a direct spreading method. 37. The wireless communication method according to claim 29, wherein in the transmitting step, transmission is performed using a frequency hopping method. 38. A wireless communication in a switching system, which comprises a main device that accommodates at least one line and has a switching function, and a wireless communication device that performs communication between the wireless communication devices after the main device performs a wireless link. In the method, a slot in a communication frame for detecting a transmission request from the other wireless communication device is set according to the priority of data to be transmitted, and the transmission request from the other wireless communication device is in the set slot. A wireless communication method comprising: detecting each of the above, transmitting a transmission request based on the result, and transmitting data. 39. The detecting step detects a carrier transmitted as a transmission request in a slot in a communication frame, and when there is no carrier in the slot, determines that there is no transmission request from the other wireless communication device. 39. The wireless communication method according to claim 38, wherein: 40. The setting step also sets a slot in a communication frame for transmitting a carrier to be transmitted as a transmission request, and the transmitting step transmits the carrier in the set slot. 39. The wireless communication method according to claim 38. 41. The wireless communication method according to claim 38, wherein in the setting step, a slot in the communication frame is set by the calling side wireless communication device and the called side wireless communication device. 42. The setting step assigns a high priority to a calling side wireless communication device and a low priority to a called side wireless communication device to a slot in a communication frame. Wireless communication method. 43. The setting step assigns a high priority to a called side wireless communication device and a low priority to a calling side wireless communication device to a slot in a communication frame. Wireless communication method. 44. The wireless communication method according to claim 39, wherein in the setting step, a special slot is set in the communication frame for data to be transmitted particularly preferentially. 45. The wireless communication method according to claim 38, wherein in the transmitting step, transmission is performed using a direct spreading method. 46. The wireless communication method according to claim 38, wherein in the transmitting step, transmission is performed using a frequency hopping method. 47. In a communication device for performing time division communication, setting means for setting a slot position in a communication frame for detecting a transmission request from another communication device according to the priority of data to be transmitted, Detecting means for detecting a transmission request from the communication device, and the detecting means detects the transmission request within the slot set by the setting means, and based on the result, transmits the transmission request and transmits the data. A communication device comprising: a transmission unit. 48. The detecting means detects a carrier transmitted as a transmission request in a slot in a communication frame, and when there is no carrier in the slot, determines that there is no transmission request from another communication device. 48. The communication device according to claim 47, wherein: 49. The setting means also sets a slot in a communication frame for transmitting a carrier transmitted as a transmission request, and transmits the carrier in the slot set by the transmitting means. The communication device according to claim 47. 50. The communication device according to claim 47, wherein the setting unit sets a slot in a communication frame between the calling communication device and the called communication device. 51. The communication device according to claim 50, wherein the setting means assigns a high priority to the calling communication device and a low priority to the called communication device to a slot in the communication frame. . 52. The communication device according to claim 50, wherein the setting means assigns a high priority to the called communication device and a low priority to the calling communication device to a slot in the communication frame. . 53. The communication apparatus according to claim 48, wherein the setting unit sets a special slot for data to be transmitted in a communication frame with a higher priority. 54. The communication device according to claim 47, wherein said transmission means performs wireless communication. 55. In a communication method for performing time-division communication, a slot position in a communication frame for detecting a transmission request from another communication device is set according to a priority order of data to be transmitted, and the set slot is set. A communication method, comprising the steps of detecting whether there is a transmission request from another communication device, transmitting a transmission request based on the result, and transmitting data. 56. The detecting step detects a carrier transmitted as a transmission request in a slot in a communication frame, and when there is no carrier in the slot, determines that there is no transmission request from another communication device. 56. The communication method according to claim 55, wherein: 57. The setting step also sets a slot in a communication frame for transmitting a carrier transmitted as a transmission request, and the transmitting step transmits a carrier in the set slot. The communication method according to claim 55. 58. The communication method according to claim 55, wherein in the setting step, the slot in the communication frame is set by the calling side communication device and the called side communication device. 59. The communication method according to claim 58, wherein in the setting step, a high priority is assigned to a calling communication device and a low priority is assigned to a call communication device to a slot in a communication frame. . 60. The communication method according to claim 58, wherein in the setting step, a high priority is assigned to a called communication device and a low priority is assigned to a calling communication device to a slot in a communication frame. . 61. The communication method according to claim 58, wherein in the setting step, a special slot is set in the communication frame for data to be transmitted particularly preferentially. 62. The communication method according to claim 55, wherein in the transmitting step, communication is performed wirelessly.